I read recently, in Gregory Clark’s A Farewell to Alms, that the diet of the rural English worker before the industrial revolution probably delivered 4500 calories a day. That’s the kind of energy you need if you’re going to do manual labor 12 to 16 hours out of every 24.
That’s what I need to plan for my next vacation, if I’m going to keep up with the six-year-old and the four-year-old and Sir Edmund one-year-old. Rest is hard to guarantee, but 4500 calories a day should be easy.
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